“Hey, let’s talk on Skype.”

Authorities had for years complained that Skype’s encryption and other features made tracking drug lords, pedophiles and terrorists more difficult. Jihadis recommended the service on online forums. Police listening to traditional wiretaps occasionally would hear wary suspects say to one another, “Hey, let’s talk on Skype.”

Those who said “Hey, let’s talk on Gtalk.” in phone, also should be careful.